Deck 18: Resistive Inductive Series Circuits

Question 1

In a series RL circuit E_T = 120 V, R = 150 Ω , and X_L = 270 Ω . What is the reactive power?

A) 36.62 VARs
B) 40.75 VARs
C) 42.64 VARs
D) 53.39 VARs

Answer 1

B

Question 2

You connect a clamp-on ammeter and a voltmeter to a series RL circuit powered by a 60-Hz circuit. The voltage reads 120 V and the current is 0.715 A. The resistor is 150 Ω . What is the true power?

A) 65.8 W
B) 76.68 W
C) 86 W
D) 167.83 W

Answer 2

B

Question 3

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . Angle theta is _____.

A) 48.37 °
B) 52.27 °
C) 63.97 °
D) 72.55 °

Answer 3

A

Question 4

In a series RL circuit, the angle between the voltage and current is called angle theta ( ∠θ ). The cosine of the angle is equal to the _____.

A) watts
B) power factor
C) VARs
D) volt-amperes

Question 5

A series RL circuit contains two resistors and two inductors. The resistors are 33 Ω and 47 Ω . The inductors have inductive reactances of 60 Ω and 30 Ω . The applied voltage is 120 V. What is the voltage drop on the 33 Ω resistor?

A) 32.89 V
B) 46.84 V
C) 55 V
D) 60 V

Question 6

Power factor (PF) is the ratio of the _____ power to the _____ power.

A) true; apparent
B) apparent; true
C) apparent; reactive
D) reactive; apparent

Question 7

In a series circuit, the total _____ is equal to the sum of the individual resistors.

A) current
B) amperage
C) voltage
D) resistance

Question 8

In a series RL circuit, E_T = 120 V, R = 30 Ω , and X_L = 40 Ω . What is the apparent power?

A) 17.92 VA
B) 172.8 VA
C) 230.4 VA
D) 288 VA

Question 9

A series RL circuit has a resistance of 270 Ω and an inductive reactance of 155 Ω . How many degrees is angle theta ( ∠θ )?

A) 4.97 °
B) 5.03 °
C) 10.14 °
D) 29.86 °

Question 10

Dividing a circuit's total applied voltage by the total impedance results in the total _____.

A) current
B) power
C) VA
D) VARs

Question 11

Of the different power values in an RL circuit, which one is known as apparent power?

A) VA
B) VARs
C) W

Question 12

A series RL circuit contains two resistors. The resistors are 60 Ω and 30 Ω . When calculating the circuit values, the total resistance used is _____.

A) 30 Ω
B) 60 Ω
C) 80 Ω
D) 90 Ω

Question 13

Of the different power values in an RL circuit, which one is known as wattless power?

A) VA
B) VARs
C) W

Question 14

In a series RL circuit, E_T = 120 V, R = 40 Ω , and X_L = 30 Ω . What is E_R?

A) 72 V
B) 88.57 V
C) 96 V
D) 151.43 V

Question 15

A series RL circuit contains two resistors and two inductors. The resistors are 27 Ω and 47 Ω . The inductors have inductive reactances of 50 Ω and 40 Ω . The applied voltage is 120 V. What is the voltage drop on the inductor that has 40 Ω of reactance?

A) 28.41 V
B) 41.2 V
C) 51.5 V
D) 67.81 V

Question 16

A series RL circuit contains two resistors. The resistors are 33 Ω and 47 Ω . When calculating the circuit values, the total resistance used is _____.

A) 56 Ω
B) 60 Ω
C) 68 Ω
D) 80 Ω

Question 17

Of the different power values in an RL circuit, which one is known as quadrature power?

A) VA
B) W
C) VARs

Question 18

In a series RL circuit, E_T = 120 V, R = 500 Ω , and X_L = 500 Ω . What is the true power?

A) 8.8 W
B) 14.4 W
C) 17.2 W
D) 20.36 W

Question 19

A series RL circuit contains two resistors and two inductors. The resistors are 43 Ω and 54 Ω . The inductors have inductive reactances of 70 Ω and 40 Ω . The total impedance is _____.

A) 52.15 Ω
B) 67.20 Ω
C) 84.94 Ω
D) 146.66 Ω

Question 20

In a series RL circuit, E_T = 120 V, R = 40 Ω , and X_L = 30 Ω . How much is E_L?

A) 72 V
B) 78.57 V
C) 86 V
D) 91.43 V

Question 21

A series RL circuit has two resistors and two inductors. The resistors dissipate 7 W and 12 W. The inductive powers are 15 VARs and 8 VARs. The applied voltage is 240 V. How much is the circuit current?

A) 8.045 A
B) 10.43 A
C) 19.83 A
D) 22.63 A